Merge branch 'master' of git://git.denx.de/u-boot-ubi

[u-boot] / doc / README.enetaddr

diff --git a/doc/README.enetaddr b/doc/README.enetaddr
index 1d75aa3876efc8c47bbe9e6c76963ef0ec105bf0..2d8e24f5cb4df128dcf5fdba00ed244614791f25 100644 (file)
--- a/doc/README.enetaddr
+++ b/doc/README.enetaddr
@@ -28,6 +28,19 @@ Here are the places where MAC addresses might be stored:
              purpose of passing this information to an OS kernel we are about
              to boot
 
+Correct flow of setting up the MAC address (summarized):
+
+1. Read from hardware in initialize() function
+2. Read from environment in net/eth.c after initialize()
+3. Give priority to the value in the environment if a conflict
+4. Program the address into hardware if the following conditions are met:
+       a) The relevant driver has a 'write_addr' function
+       b) The user hasn't set an 'ethmacskip' environment variable
+       c) The address is valid (unicast, not all-zeros)
+
+Previous behavior had the MAC address always being programmed into hardware
+in the device's init() function.
+
 -------
  Usage
 -------